Kanye West announced that he and Kim Kardashian are having a baby

US rapper Kanye West and reality TV star Kim Kardashian are expecting their first child, celebrity media outlets report.

"Been wanting to shout from the rooftops with joy and now I can!" tweets Kardashian's sister Kourtney.

According to E! News, West, 35, announced the news from the stage at a concert in Atlantic City on Sunday.

KIM Kardashian reportedly had "no idea" Kanye West was planning to reveal she is pregnant.